I hope your install goes better than mine. I dicked around for 4 hours with my install until I came to the conclusion that I had a DOA box in the kit. I am waiting for discount car stereo to send me a replacement one, hopefully it gets here today or Monday.
I used both the power point for the cigarette lighter and that provides a good source but you can also tap right into the plug for the deck if you know the wires. I did at one point but it's been a year.